Sextus Empiricus (Greek: Σέξτος Ἐμπειρικός; c. 160 – c. 210 CE, dates uncertain), was a physician and philosopher, who likely lived in Alexandria, Rome, or Athens. His philosophical work is the most complete surviving account of ancient Greek and Roman Pyrrhonism.
In his medical work, as reflected by his name, tradition maintains that he belonged to the empiric school in which Pyrrhonism was popular. However, at least twice in his writings, Sextus seems to place himself closer to the methodic school. He may have been the same person as Sextus of Chaeronea.